Summary
Garden lighting is a job that customers price-shop badly and tradespeople under-price worse. A homeowner comparing a £40 B&Q solar spike-light kit to a proper BS 7671 Section 714-compliant installation with SWA cable, RCD protection and a Part P certificate sees two "garden lighting jobs." They are not the same job, and pricing them as if they were is how tradespeople lose money on the compliant work and lose the sale on the cheap work.
The pricing logic that actually holds up is the same one used across every electrical pricing guide on this site: separate the compliance-driven cost floor (what BS 7671 and Part P require you to do, which is non-negotiable) from the scope-driven variables (how far the cable run is, how many fittings, whether there's hard landscaping to break through). Quote the floor honestly, then price the variables transparently, then apply your markup on top. Never quote a "nice round number" pulled from a competitor's website — build it from real components.
The other reason to price this carefully: garden lighting frequently escalates mid-quote. A customer who asks for "a few lights by the patio" often means "I want the whole garden lit, but I haven't thought about it yet." Walking the site and pricing zone by zone avoids under-quoting a job that turns into a full garden lighting scheme once the customer sees what's possible.
Key Facts
- Cost vs price — cost is what materials and labour actually cost the tradesperson; price is what's quoted to the customer after markup and VAT. Never present cost figures to a customer as the quote.
- SELV (low-voltage, typically 12V/24V) systems are materially cheaper to install than mains circuits — no core drilling of consumer units, simpler cable, and (on straightforward extensions to an existing outdoor supply) may avoid Part P notification, though the mains-side transformer connection still must comply with BS 7671.
- Mains (230V) circuits cost more in labour because they require a dedicated way at the consumer unit, SWA cable for buried runs, RCD protection, and — if a new circuit is created — Part P notification (self-certified by a registered installer or notified to Building Control).
- Typical UK trade labour rate for this work — electricians £45–£70/hr; landscaper/electrician combined teams often blend a landscaping rate (£35–£45/hr) for trenching with an electrician's rate for the circuit work.
- RCD protection is mandatory on outdoor circuits per BS 7671 Regulation 411.3.3 — factor this into every quote; it is not an optional extra.
- SWA (steel wire armoured) cable is the standard for buried mains runs; typical trade cost £2.50–£5/metre for 2.5mm² 3-core, more for larger cross-sections needed on long runs (voltage drop).
- Core drilling / cable entry through masonry typically costs £40–£80 per hole in labour and consumables.
- Trenching is the most variable cost — hand-digging in open soil is cheap per metre; breaking out and reinstating a patio, path or driveway can add hundreds of pounds and should always be priced separately and itemised.
- Part P notification cost — if self-certifying via a competent person scheme (NICEIC, NAPIT, ELECSA, STROMA), there is no per-job Building Control fee, only the electrician's scheme membership cost already built into their rate. Non-registered installers must notify Building Control directly (£150–£300+ per notification).
- Testing and certification time — an Electrical Installation Certificate (EIC) for a new circuit, or a Minor Electrical Installation Works Certificate (MEIWC) for an extension, takes 30–60 minutes of billable time that is frequently left out of quotes.
- Voltage drop on long SELV runs — cheap thin-gauge SELV cable run more than 15–20m from the transformer can under-power end fittings; budget for heavier-gauge cable or a second transformer on long runs rather than a callback.
- Zone/smart controllers add £60–£350 to materials depending on complexity (simple timer vs app-controlled multi-zone dimming).
Quick Reference Table
Spending too long on quotes? squote turns a 2-minute voice recording into a professional quote.
Try squote free →| Job Type | Materials Cost | Labour Hours | Trade Cost (materials + labour) | Typical Customer Price |
|---|---|---|---|---|
| SELV deck/spike lights (4–6 fittings), plug-in transformer | £90–£180 | 2–4 | £180–£400 | £350–£650 |
| SELV path lighting (8–12 fittings), hardwired transformer, timer | £200–£400 | 4–7 | £400–£750 | £650–£1,200 |
| Mains SWA circuit, single PIR security floodlight | £70–£140 | 3–5 | £245–£445 | £450–£750 |
| Mains SWA circuit, 3–4 IP65 wall lights + PIR floodlight | £250–£450 | 7–9 | £635–£945 | £1,000–£1,500 |
| Festoon/string lighting, mains, RCD-protected outdoor socket | £150–£350 | 4–6 | £370–£680 | £600–£1,000 |
| Submersible pond/water feature lighting (IP68, SELV) | £100–£250 | 3–5 | £235–£475 | £400–£750 |
| Full multi-zone garden lighting scheme (10+ fittings, mixed mains/SELV, dedicated outdoor CU) | £800–£2,000 | 20–35 | £1,700–£3,575 | £3,000–£6,000+ |
Detailed Guidance
Building the price: five components
- Compliance baseline — decide mains vs SELV, confirm the circuit route from the consumer unit, and check whether the job creates a new circuit (Part P notifiable) or extends an existing one. This decision drives every other cost in the quote. See part p notifiable work for the notification decision in full.
- Cable route and burial — walk the actual route with the customer. Distinguish open-soil trenching (cheap) from routes crossing paving, patios, or driveways (expensive to break out and reinstate — always itemise this separately so the customer understands what they're paying for).
- Fittings and IP ratings — price fittings by their actual exposure, not by what looks nice in the catalogue. An IP68 buried uplighter costs 2–3× an IP44 wall light; specify correctly rather than downgrading to save money, which creates callbacks and warranty claims.
- Electrical first-fix and testing — spare way at the consumer unit (or new outdoor sub-board for larger schemes), RCD protection, and the EIC/MEIWC paperwork. This is the part most likely to be under-quoted because it "doesn't look like much work" on the day.
- Reinstatement — turf, planting, paving relaid. Agree upfront who is responsible for this; it is a frequent source of dispute if left unstated in the quote.
Add a contingency of 10–15% for routine gardens, and 20–25% where the ground has unknown services, tree roots, or hard landscaping that hasn't been fully surveyed.
Mains vs SELV: how the cost split actually works
The customer rarely understands why "a few garden lights" can cost £400 or £2,000 depending on which system is specified. Explain it in these terms:
SELV systems cost less because the low-voltage side of the installation doesn't need SWA cable, doesn't need RCD-protected sockets at each fitting, and the fittings themselves are typically cheaper to buy. The cost that remains is the transformer (which must be installed and weatherproofed correctly — a bare transformer left in wet grass is a common failure point and a comeback job) and the mains-side connection feeding it, which still needs to comply with BS 7671.
Mains systems cost more because every fitting is a mains-voltage device requiring correct cable, glanding, and RCD protection, and because a new circuit is very likely required — pulling in Part P. Mains systems are the only realistic option for higher-draw loads (floodlighting, powered water features) and for longer runs where SELV voltage drop becomes a problem.
For technical detail on cable, IP ratings and Part P scope specific to garden lighting, see garden lighting installation.
Where quotes go wrong: the escalation trap
Garden lighting quotes commonly start small and grow once the customer sees the plan laid out. Price defensively:
- Quote per-zone (patio, path, planting beds, boundary) rather than as one lump sum, so additions are easy to cost incrementally rather than requiring a full re-quote.
- If the customer's ask implies a new circuit but they've only described "a couple of lights," flag the Part P implication and cost before starting — not after the trench is dug.
- Where the garden has existing (unknown-age) outdoor wiring, price a visual inspection and, if in doubt, an EICR before connecting anything new to it. Old, undocumented garden wiring is a common hidden hazard.
Worked Example: Mains SWA circuit, patio wall lights + PIR floodlight
Job: New RCD-protected mains circuit from a spare way at the consumer unit, 12m SWA run (hand-dug trench, open soil, no hard landscaping to cross) to a distribution point on the patio wall, feeding three IP65 wall lights and one IP65 PIR floodlight. Self-certified by a registered electrician (NICEIC), EIC issued.
| Item | Cost |
|---|---|
| SWA cable 2.5mm² 3-core, 12m @ £3.20/m | £38.40 |
| SWA glands (x2) | £24.00 |
| Spare RCBO way at consumer unit | £35.00 |
| IP65 wall light fittings (x3 @ £45) | £135.00 |
| IP65 PIR floodlight | £45.00 |
| Warning tape, 12m | £15.00 |
| Sundries (grommets, sealant, fixings) | £15.00 |
| Materials subtotal (cost) | £307.40 |
| Labour: trenching (3 hrs), cable pull/first fix (2 hrs), fitting mounting/second fix (2 hrs), testing/certification (1 hr) — 8 hrs @ £55/hr | £440.00 |
| Labour subtotal (cost) | £440.00 |
| Total job cost (materials + labour) | £747.40 |
| Markup 20% | £149.48 |
| Net price (quoted, ex-VAT) | £896.88 |
| VAT 20% (if VAT-registered) | £179.38 |
| Customer price (inc. VAT) | £1,076.26 |
Note the distinction: £747.40 is what the job costs the tradesperson. £1,076.26 is what's quoted to the customer once margin and VAT are applied. A non-VAT-registered sole trader doing identical work would quote around £897 — the gap is a legitimate difference in business overheads, not something to apologise for or obscure.
Frequently Asked Questions
Is garden lighting always Part P notifiable?
Not always, but usually. Installing a new circuit from the consumer unit — which most garden lighting jobs require — is notifiable in England and Wales. Extending an existing circuit outside a special location may not be notifiable, but garden lighting frequently touches special-location considerations (outdoor locations are special in Wales; new circuits are notifiable everywhere). Treat garden electrical work as notifiable unless you've specifically confirmed the exemption applies to your exact scope. Full decision detail in part p notifiable work.
Why is SELV lighting so much cheaper to install?
SELV (typically 12V/24V) removes the mains-voltage risk from most of the installation, which removes the need for SWA cable, RCD-protected fittings at each point, and — on simple extensions of an existing supply — the Part P new-circuit trigger. The cost that remains is a correctly weatherproofed transformer and a compliant mains-side spur feeding it. It is not "unregulated" — it's a smaller regulated scope.
Should I quote garden lighting as one lump sum or itemised?
Itemised, always. Garden lighting jobs escalate more than almost any other domestic electrical job because customers don't know what they want until they see options. A lump-sum quote gets renegotiated awkwardly mid-job when the customer adds "just one more light." A per-zone, per-fitting itemised quote lets you price additions cleanly and protects your margin.
What's the biggest hidden cost on garden lighting jobs?
Reinstatement — breaking out and relaying patios, paths or driveways to bury cable, and making good turf and planting after trenching. This is routinely left out of DIY-competitor quotes and is where a "cheap" quote and a professional quote diverge most sharply. Always itemise it and agree responsibility with the customer before starting.
Do I need to price annual servicing into a garden lighting quote?
Not as a mandatory line item, but it's worth offering as an optional extra — outdoor fittings and buried cable are exposed to weather, ground movement and garden tools in a way indoor circuits never are. A brief annual visual check (IP seal condition, RCD test, fitting corrosion) is a low-cost add-on that generates repeat business and catches problems before they become failures.
Regulations & Standards
BS 7671:2018+A2:2022 (IET Wiring Regulations, 18th Edition) — Section 714 Outdoor lighting installations; Regulation 411.3.3 (mandatory RCD protection for outdoor socket-outlets and mobile equipment)
Building Regulations Part P (Electrical safety — dwellings, England) — notification requirements for new and altered circuits
BS EN 60529 — IP (Ingress Protection) rating system for fittings and enclosures
Competent Person Scheme registration (NICEIC, NAPIT, ELECSA, STROMA) — required for self-certification of Part P notifiable work
Approved Document P — HM Government
garden lighting installation — cable selection, IP ratings and Section 714 technical detail for garden lighting
part p notifiable work — full decision guide on what electrical work needs Building Control notification
part p notifications — notifiable work list and competent person schemes
extractor fan installation pricing guide — comparable pricing-logic model for another Part P-adjacent job